<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
    </style>
</head>
<body>
<input type="button" value="点我点我"/>
</body>
<script src="myJquery2.6.js"></script>

<script>
    jQuery.extend({

    });

</script>
<script>
    $('input').click(function(){
        alert('1');
    });
    $('input').click(function(){
        alert('2');
    });
    $('input').click(function(){
        alert('3');
    });
/*

    $('input').dblclick(function(){
        alert('haha');
    });
*/

</script>
</html>